Wrench



(No Model.) A

P. FAB-BAR.

WRENCH. No. 331,627; I Patented Dec. 1, 1885.

UNITED STATES PATENT rrrcn.

FREDERICK FARRAR, OF BOSTON, MASSACHUSETTS.

WRENCH.

SPECIFICATION forming part of Letters Patent No. 331,627, dated December1, 1885.

Application filed March 9, 1885.

.To aZZ whom it may concern:

Be it known that I, FREDERICK FARRAR, of Boston, county of Suffolk,State of Massachusetts, have invented an Improvement in- W'renches, ofwhich the following description, in connection with the accompanyingdrawings, is aspecification, like letters on the drawings representinglike parts This invention in wrenches is an improvement upon that classof wrench wherein the jaws are made movable on a head-block having anattached ratchet-toothed segment pivoted upon a slotted shank portion,my invention having for its object to simplify and improve theconstruction of wrenches of the class referred to, and to make the samecapable of resisting much greater strain than heretofore.

To this end the invention consists in the combination and arrangement ofparts,as hereinafter described, and more particularly set forth in theclaim.

Figure 1 shows in elevation a wrench embodying my invention, the shankportion being broken away to more fully show the operating parts; Fig.2, an end view of the headblock and jaws; Fig. 3, a cross-section of thehead-block, taken on the dotted line mm, Fig. 5; Fig. 4., across-section of a jaw, taken on dotted line :0 .25 Fig. 2; and Fig. 5,a longttudinal section of the head-block.

The shank port-ion A, having the handle A, is slotted at its end toreceive the ratchet toothed segment a, forming, preferably, an integralpart of the head-block c, the pin a serving as a pivot for the saidhead. The slot in the shank A also receives a pawl, b, pivoted at Dwhich co-operates with the ratchettoothed segment a to hold the same inany desired position. The pawl b is normally held in engagement with theratchet-toothed segment to by the spring I) acting on the thumbpiece 12,the depression of the latter disengaging the pawl z from the saidratchet-toothed segment. The head-block 0, preferably integral with theratchet-toothed segment, is recessed or grooved, as at 0, parallel withand at each side of the screw or bolt (1, to form guideways for themovable jaws 2 3, which are provided with correspondingguiding-projections 0 The head-block c is recessed or Serial No.158,180. (No model.)

bored longitudinally, as shown in Fig. 5, the portione serving as abearing for the rightand-left-threaded bolt or screw d, which is passedtherethrough, and the portion e of the recess being of larger diameterand cut away, as shown in Fig. 2, leaving open slots or guideways forthe bridge-pieces f, which extend across and unite the guide portions ofeach of the movable jaws. The bridge-pieces f of the movable jaws areoppositely screwthreaded internally, as at 4, to engage theright-and-left-threaded bolt (2, rotation of which moves the jaws on thehead-block.

The bolt (2 is turned by a suitable milled thumbnut, d, secured thereto,preferably a not at each end of the bolt. Upon turning the bolt d in onedirection the movable jaws 2 3 may be made to approach each other untiltheir faces meet, the bridge-pieces f following in the slots. Theguideways c are at opposite sides of and parallel with the bolt (I, sothat no strain comes upon the bolt (1 to injure the wrench; but, on thecontrary, the entire strain of the jaws comes upon the guide portions ofthe head-block, which areengaged by the guide portions 0 as shown, thehead block, not the bolt (2, resisting'the strain exerted upon the jaws.This forms the mostimportant feature of my invention.

The head-block supporting the jaws being pivoted and controlledbyaratchet and paw]. any inclination desired may be given to the jawswith relation to the shank portion.

I am aware that wrenches have been made consisting of a guide-blockhaving an integral ratchet-toothed segment pivoted to the shank portionof the wrench, and that a head-block has been provided with a singleguide, upon which the movable jaws were made to slide by means of aright-and-leftthreaded screw or bolt; but such construction I do notherein claim, as it is obvious that the entire strain comes upon thebolt.

I claim A wrench comprising the head-block c, piv oted to the handledshank and provided with the ratchet-toothed segment and pawlco-operating therewith, the double-acting screw d, arranged in saidhead-block, and the guides 0 c on opposite faces of the head-block andboth sides of the screw, combined with the jaws 2 and 3, having theguidin rojeet'ons c? 0? tot is speeifieatipnin the presence of two sub-A KJ. -v i 4 ,I x

engaging said guides c c, andthe threaded scri ing'witnesses.

bridges f to receive the screw to cause said jaws to m ovein parallelismand without strain FREDK' FARRAR' 5 and tendency to bind upon the screw,sub- Witnesses:

stantially as shown and described. SIMON HA-THEWAY,

In testimony whereof I have signed my name BQ JQ NoYEs.

